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From: Paul Stewart <phorefaux@gmail.com>
Newsgroups: comp.sys.acorn.programmer
Subject: OS_Find &4F
Date: Sat, 21 Feb 2026 23:08:36 GMT
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Hi there,

Trying to read a log file when the file is already open by the the utility 
that is create it.(downloading a file using WGet and reading the log file 
to display percentage downloaded)

Using SYS "XOS_Find",&4F,file$ TO handle%

Now the above works fine on my RO4.42 and RO5 devices.

When I test with VRPC with RO4 and RO6, Error is generated: Handle is 
either illegal or has been closed and errors with the line number the 
above SYS command is on.

I'm doing
OS_Find command to open the file
getting the size
OS_GBPB to read into buffer
OS_Find to then close the file.

Above all works fine on 4.42 and 5, but generates the Handle is either 
illegal or has been closed error on RO4 and RO6.

Any ideas as to why the RO4 and RO6 do not like SYS "XOS_Find",&4F,file$ 
TO handle% with a file that is already open and being updated, where as 
other OS's are fine with it?

-- 
Paul Stewart
Sent from A9home running RISC OS 4.42